Nematoda (roundworms)

Ascaris lumbricoides
Enterobius vermicularis (pinworm)
Capillaria hepatica
Trichinella spiralis
Ancyclostoma spp.(hookworms)
Necator spp.
Trichuris spp.(whipworms)
Dirofilaria immitis (heartworm)

Leeches

Hirudo medicinalis